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Sourcing a single nylon pinion that covers the widest possible range of motor shaft diameters — from small hobby motors to mid-frame stepper shafts — without ordering multiple SKUs is a common frustration for robotics engineers, automation hobbyists, and mechatronics educators. The 1 Mod 20 Teeth Blue Nylon Spur Gear solves this with eight stepped bore options spanning 4 mm to 12 mm, making it one of the most shaft-compatible Module 1 plastic pinions available for DIY and light industrial drive applications.
This stepped-bore nylon spur gear is formed from engineering-grade blue nylon (PA-class polymer), offering dimensional stability, inherent self-lubrication, and resistance to oils and mild chemicals. The gear carries 20 teeth at Module 1, giving a pitch diameter of 20 mm (approx. 0.79 in) and an outer diameter of approximately 22 mm (0.87 in). The stepped bore accommodates shaft diameters of 4, 5, 6, 6.35, 7, 8, 10, and 12 mm (0.16 in to 0.47 in), covering small DC motors, NEMA 14/17/23 stepper shafts, and 1/4-inch imperial shafts (6.35 mm).
Typical use cases include: motor-to-gearbox pinion stages in wheeled robots and conveyor prototypes where a 1 Mod 20-tooth nylon spur gear pairs with a larger mating gear for speed reduction; feed-axis and Z-axis drives in desktop CNC routers and 3D printers requiring a low-noise Module 1 plastic pinion on a NEMA 17 or NEMA 23 shaft; and educational mechatronics assemblies where a single interchangeable 20-tooth nylon gear meshes with standard 1M racks, worm wheels, or compound gear trains.
| Module | 1 (1M) |
|---|---|
| Number of Teeth | 20 |
| Pitch Diameter | 20 mm (0.79 in) |
| Outer Diameter (approx.) | 22 mm (0.87 in) |
| Bore Diameter | See variant options (4 / 5 / 6 / 6.35 / 7 / 8 / 10 / 12 mm) |
| Gear Width (Face Width) | See variant options |
| Material | Engineering-grade nylon (PA-class polymer) |
| Color | Blue |
| Pressure Angle | 20° |
| Bore Style | Stepped bore with hub |
| Imperial Bore Option | 6.35 mm (1/4 in) included |
| Lubrication Required | Not required (self-lubricating); light grease optional |
| Corrosion Resistance | Resistant to moisture, oils, and mild chemicals |
| Packing Quantity | 1 PCS / 2 PCS / 5 PCS / 10 PCS (select above) |
Measure your motor or drive shaft diameter with a caliper before ordering. Available bore options are 4, 5, 6, 6.35, 7, 8, 10, and 12 mm. The 6.35 mm option fits standard 1/4-inch imperial shafts. Select the bore that matches your shaft exactly — the stepped bore design does not allow cross-size adjustment after purchase.
Yes. This gear uses the standard Module 1 tooth profile with a 20° pressure angle, making it fully compatible with any Module 1 (1M) spur gear, rack, or pinion regardless of material. Confirm that your mating component is also rated Module 1 before pairing.
Engineering-grade nylon handles light-to-medium loads well — typical for small DC motors, stepper-driven axes, and educational mechanisms. It is not recommended for high-torque or continuous heavy-duty industrial drives, where steel or brass gears are more appropriate. For most DIY and maker applications with motors in the low-to-mid watt range, nylon provides adequate strength with lower noise and weight.
No regular lubrication is required — nylon is inherently self-lubricating. For high-cycle or continuous-duty use, a light application of dry PTFE spray or compatible grease on the tooth faces can extend service life. Avoid petroleum-based greases that may degrade certain nylon grades over extended contact.
Nylon offers good resistance to moisture, mild acids, oils, and common solvents, making it suitable for humid indoor environments and light outdoor use. For prolonged outdoor exposure or submerged applications, verify compatibility with your specific conditions, as extended UV exposure can affect nylon over time.
Gear ratio equals the driven gear's tooth count divided by this pinion's 20 teeth. For example: pairing with a 40-tooth gear gives 2:1 reduction; a 60-tooth gear gives 3:1; an 80-tooth gear gives 4:1. Use this relationship to calculate the speed and torque output needed for your specific drive stage.
The 1 PCS option suits single-axis prototyping or evaluation. The 2 PCS pack works for dual-axis or mirrored drive configurations. The 5 PCS pack is practical for small production runs or classroom kits. The 10 PCS pack offers the best per-unit value for larger builds, spare-parts stock, or multi-robot projects.
